At first glance, the Saratoga Creek Bridge stands as a quiet, historic landmark nestled among redwoods. But beneath its stone arches, a deeper story was unfolding—soft concrete, hidden voids, and signs of corrosion threatening its long-term stability. Concrete Science, Inc. was called in to uncover the unseen. Through advanced petrographic analysis, chemical testing, and meticulous fieldwork, the investigation revealed critical structural vulnerabilities and environmental threats.